Device for equalizing the thread tensions for twisting devices



March 7, 1933. Q BQCHMANN ET AL 1,900,037

DEVICE FOR EQUALIZING THE THREAD TENSIONS FOR TWISTING DEVICES Filed April 4, 1931 2 Sheets-Sheet l Invelfi orS 5 March 7, 1933. I O BOCHMANN ET AL 1,900,037

N I R TWISTING ICES 4, 1931 2 Sheets-Sheet 2 Patented Mar. 7, 1933 UNITED' STATES PATENT OFFICE OTTO BOCHHANN AND WILHELM LENK,

OF REMSCEEID-LENNEP, GERMANY, A8-

SIGNOBS 1'0 BARKER MASGHINENFABRIK A.-G., OF WUPPERTAL-OBERBARHEN,

GERMANY DEVICE FOR EQUALIZING THE THREAD TENSIONS FOR TWIS'IING DEVICES Application filed April 4, 1931, Serial No.

This invention relates to a device for equalizing the thread tensions for twisting devices, in which during each spindle rotation several twists are imparted to the thread.

5 In spindles of this type the thread is drawn is conducted through the hollow spindle and guided over a rotating twisting disc to the running on spool. These spindles are however open to the objection that during the twisting operation no equalizing of the different tensions occurs which arise during the twisting. These variations in tension are caused, amongst other things, by thread of unequal thickness, in the case of lateral drawing oif owing to the different thread running off angles and by the changing diameter of the bobbin from which the thread is running off, in the case of pulling off over head, by the more or less strong friction on the wall of the running off bobbin. Owing to this irregular tension during the twisting operation a breaking of the thread often .occurs so that uninterrupted work is not possible with these spindles. Moreover diameter variations of the balloon are caused thereby, which result in an irregular yarn.

The above mentioned objections are increased in that, owing to the flat form of the twisting disc, the thread only bears at one point and is there kinked so that it is strongly stressed and consequently higher tensions occur, which do not allow of high speed twisting. Further the passing of the thread through the hollow spindle. is very inconvenient, and the thread is also kinked on leaving the spindle resulting in an also unfavourable thread stressing.

These objections are overcome according to the invention. The novelty consists in that, for accommodating a thread reserve between the thread delivery point in the hollow spindle and the twisting disc, a thread storing ring is arranged, rigidly connected to the whirl or to the twisting disc. The hollow spindle guiding the thread to the thread storing ring can be cast in the flyer,

527,750, and in Germany April 12,1030.

composed of the driving whirl and the twisting dlsc, and guided in bow-shape in the nterior, so that the thread delivery point is situated directly on the circumference of the thread storing ring. The thread is further guided over the twisting disc, which is of calotte-shape adapted to the thread bal loon. The thread storing ring is either constructed as a divided ring or composed of separate thread guide rollers. It may however be a closed ring having a groove in its circumference for accommodating the thread reserve.

The advantages of the invention consist in that the thread always receives a uniform, soft tension with constant balloon size, so that thread breakages are prevented, a uniform twine is produced and it is possible to twist with the maximum spindle speeds, for example up to 18,000 spindle revolutions= 36,000 thread twists per minute. These ad vantages are obtained in that the fluctuatin frictional forces of the runnin off threa which occur on the running 0 bobbin and in the twisting spindle, are always equalized so that they are always equal to the centrifugal force of the thread balloon. In the event of the thread tension decreasing, the excess thread is wound on the storing ring so that the reduced friction is increased, owing to the thread passing over a greater or lesser portion of the circumference of the storing ring, and consequently the equalizing is again established relative to the centrifugal force of the balloon. In the event of the tension increasing, the stored thread reserve unwinds, the friction occurring on the storing ring being thus reduced so that an equalization of forces again occurs between the friction and the centrifugal force of the balloon. In the first instance the winding of the thread around the storing ring is effected in that the balloon increasing in size la s behind the revolving speed of the spind e.

owing to the air resistance, whereas 1n the second instance, owing to the tangential thread pull relative to the twisting disc, the thread runs ahead of the revolving speed of the spindle. This series of operations con-. tinually repeats itself during the twisting and so rapidly that a perfect equalization of the forces takes place, so that a constant tension and uniform balloon size are obtained. in order that these tensions remain however '5 as soft as possible and that the thread has no kink points, and consequently no high stressings, it is guided to the running on bobbin through the hollow spindle bent in arc shape and over the calotteehapedtwisting disc adapted to the thread balloon. The hollow spindle cast in an arc shape ensures furl ther an easy pulling in of the thread.

Several embodiments of the invention are illustrated by way of example in the accompanying drawin s in which:

Fig. 1 shows t e twisting device in long1- tudinal section.

Fig. 2 is a section on line lL-lll of Fig. 1.

Fig. 3 is a similar section as Fig. 2 but of a modified form of construction.

Fig. 4 shows in lon itudinal section a second modified form construction of a twisting device.

Fig. 5 is a section on line V-V of Fig. i.

The rotary twisting spindle 1 is constructed as a hollow spindle and carries on its front end a loosely slipped on spool holder 2 for the bobbing 3 from which the thread is running 0d. The spool holder 2 and consequently the thread running of? bobbin 3 are held in position of rest relative to the rotating spindle by a. weight 4. A twisting disc 5 is rigidly connected to the twisting spindle 1, whereas the spindle means of a whirl 6. Between the whirl 6 and the twisting disc 5 a thread storing ring 7 is provided, which is constructed either as a divided ring or composed of separate thread guide rollers (Figs. 2 and 3). It may however also be formed as a closed ring and provided with a groove 8 in its circumference. It is advisable, in order to obtain a'better thread guiding, to cast the hollow spindle directly into the twisting device and to bend same in arc shape so that it ends directly in the circumference of the thread storing ring, the twistin adapted to tide thread balloon (Figs. 4 and 5). It is evident that in this instance a special 59 bearing spindle 9 must be provided for the twisting device.

The thread 10 coming from the running oil bobbin 3 is guided to the running on bobbin through the hollow twisting spindle 1 over the thread storing ring 7 and twisting disc 5. As soon as the thread tension decreases owing to irregular thread thickness or, in the case of lateral pulling oif, owing to the different thread running 0d angles and owing. to the changing diameter of the bobbin from which the thread is running ofl or for any other reason, the excessive quantity of thread is wound around the circumference of the thread storing ring 7, as the thread 5 lags behind relative to the spindle spe d, as

is driven by 1;

disc being of calotte-shape the boon becomes larger, owing to the air resistance. Consequently the forces are equalized in that the reduced fiiction of the thread on the thread storing ring, a the dropping of the thread tension, is a in increased until it is M; to the can 13!. force of the thread baloon. If, however, or any reason, the tension of the thread increases, the thread reserve wound on the thread storing g is fed to the thread haloon owing to the tangential thread pull on the twisting disc so that also in this ce an equalization of forces relative to the centrifugal force of the thread balloon tes place owing to the reduction of the friction.

In Fig. 5 of the drawings the running ofi of the thread is shown in several positions from the delivery point of the hollow spindle over the storing ring up to the edge of the twisting disc. At the dot-dash line the thread is wound several times around the storing ring, whereas the thread along the dash line runs ofi directly from the twisting spindle over the twisting disc. The full line shows only a short, winding of the thread on the thread storing ring. The thread consequently surrounds a greater or lesser portion of the circumference of the storing ring according to the variations in friction and passes from this ring in tangential direction over the twisting disc to the winding bobbin. Owing to the arc shape of the hollow spindle and the calotte-shape of the twisting disc 5 inking and consequently increased stressing of the thread 10 when changing direction is avoided, so that the softest possible tensions and consequently a most uniform thread are obtained. The groove 8 in the thread storing ring 7 presents the further advantage that in case the thread is wound several times around the thread storing ring, the lower thread layers cannot be thrown in outward direction owing to the centrifugal forces, so that in all cases entangling of the stored thread with the running oil thread is avoided.

We claim:

1. A device for equalizing the thread tension for twisting devices, in which during each spindle revolution several twists are imparted to the thread, comprising in combination with the hollow spindle, a whirl on said spindle, a twisting disc, and a thread storing ring arranged between the thread delivery point of said hollow spindle and said twisting disc rigidly connected to said whirl with the thread receiving face of the thread storing ring radially positioned intermediate the thread delivery point of the hollow spindle and the peripheral edge of the twisting disc adapted to accommodate a thread reserve.

- 2. A device for equalizing the thread tension for twisting devices, in which during each spindle revolution several twists are imparted to the thread, comprising in combililib Elm nation with the hollow spindle, a twisting disc, and a thread storing ring arranged between the thread delivery point of said hollow spindle and said twisting disc with the, thread receiving face of the thread storing ring radially positioned intermediate the thread delivery point of the hollow spindle and the peripheral edge of the twisting disc rigidly connected to said twisting disc adapted to accommodate a thread reserve.

3. A device as specified in claim 1, in which the thread StOI'iIlg ring is made as a closed ring. I

4. A device as specified in claim 1, in which i the thread storing ring is made as a closed ring with a groove around its circumference.

5. A device as specified in claim 1, in which the thread storing ring is made as a divided rlng.

Q0 6. A device for equalizing the thread tension for twisting devices, in which during each spindle revolution several twists are imparted to the thread, comprising in combination with the hollow spindle, a whirl on said spindle, a twisting disc, and a thread storing ring arranged between the thread delivery point of said hollow spindle and said twisting disc rigidly connected to said whirl adapted to accommodate a thread reserve, said thread storing ring being composed of several thread guide rollers.

7. A device for equalizing the thread tension for twisting devices, in which during each spindle revolution several twists are imparted to the thread, comprising in combination with the hollow spindle, a whirl on said spindle, a twisting disc, and aethread storing ring arranged between the thread delivery point of said hollow spindle and said twisting disc rigidly connected to said whirl adapted to accommodate a thread reserve, the hollow spindle guiding the thread to the thread storing ring being cast in the flyer composed of the driving whirl and the twisting disc and curved in arc shape so that the delivery point-- is situated directly on the circumference of the thread storingrring.

8. A device for equalizing the thread tension for twisting devices, in which during each spindle revolution several twists are imparted to the thread, comprising in combination with thehollow spindle, a whirl on said spindle, a twisting disc, and a thread storing ring arranged between the thread delivery point on said hollow spindle and said twisting disc rigidly connected to said whirl adapted to accommodate a thread reserve, and said twisting disc guiding the thread from the storing ring being of calotte-shape.

In testimony whereof we afiix our signatures.

OTTO BOCHMANN. WILHELM LENK. 

